Kittanning, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 17 °C (high). Annual precipitation averages 1101.9 Millimeters. Kittanning is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.9 °C | 83.31 mm |
| February | -6.3 °C | 4.6 °C | 63.25 mm |
| March | -2.4 °C | 9.7 °C | 82.55 mm |
| April | 3.1 °C | 17.6 °C | 92.2 mm |
| May | 9.2 °C | 23.3 °C | 99.31 mm |
| June | 14.4 °C | 27.4 °C | 114.3 mm |
| July | 16.6 °C | 29.5 °C | 118.87 mm |
| August | 15.8 °C | 28.9 °C | 102.87 mm |
| September | 11.9 °C | 25.3 °C | 100.58 mm |
| October | 5.6 °C | 18.4 °C | 77.22 mm |
| November | 0.3 °C | 11.2 °C | 83.06 mm |
| December | -3.7 °C | 5.2 °C | 84.33 mm |
| Annual | 4.8 °C | 17 °C | 1101.85 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |